Analog Devices UG-157 User manual

Evaluation Board User Guide
UG-157
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluation Board for the ADP5032 Micro PMU
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12
FEATURES
Full-featured evaluation board for the ADP5032
Standalone capability
Simple device measurements, including line and load
regulation, demonstrable with
A single voltage supply
A voltage meter
A current meter
Load resistors
Easy access to external components
Cascading options to supply the LDO from either buck
Dedicated enable option for each channel
Mode option to change bucks from PFM to PWM operation
GENERAL DESCRIPTION
TheADP5032 evaluation board is a two-step-down regulator with a
two-LDO solution that enables evaluation of the ADP5032. The
evaluation board is available in standard voltage options.
The ADP5032 uses a proprietary high speed, current mode,
constant frequency PWM control scheme for excellent stability
and transient response. To ensure the longest battery life in
portable applications, the ADP5032 features a power save mode
(PSM) that reduces the switching frequency under light load
conditions, as well as the option to change the mode to fixed
PWM operation. The 3 MHz switching frequency minimizes
the size of the external components.
The low quiescent current, low dropout voltage, and wide input
voltage range of the ADP5032 LDO extends the battery life of
portable devices.
Full details on the ADP5032 are provided in the ADP5032 data
sheet available from Analog Devices, Inc., which should be
consulted in conjunction with this evaluation board user guide.
DIGITAL PICTURE OF THE EVALUATION BOARD
09137-001
Figure 1.

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TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Digital Picture of the Evaluation Board......................................... 1
Revision History ............................................................................... 2
Using the Evaluation Board............................................................. 3
Powering Up the Evaluation Board............................................ 3
Measuring Evaluation Board Performance .................................. 3
Measuring Output Voltage...............................................................6
Measuring Ground Current.............................................................7
Evaluation Board Schematics and Artwork...................................8
Ordering Information.................................................................... 11
Bill of Materials........................................................................... 11
REVISION HISTORY
7/10—Revision 0: Initial Version

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USING THE EVALUATION BOARD
POWERING UP THE EVALUATION BOARD
The ADP5032 evaluation board is supplied fully assembled and
tested. Before applying power to the evaluation board, follow
the procedures in this section.
Enable
When the ADP5032 has an input voltage above the minimum
UVLO setting, the ADP5032 is enabled.
Jumper J3 (MODE)
Jumper JP3 (MODE) pulled high to J1 (VIN_1) forces Buck 1
and Buck 2 into forced PWM operation. JP3 (MODE) pulled
low to J11 (GND1) allows Buck 1 and Buck 2 to operate in
automatic PWM/PSM operation.
Input Power Source
If the input power source includes a current meter, use that meter
to monitor the input current. Connect the positive terminal of the
power source to J1 (VIN_1) on the evaluation board, and the nega-
tive terminal of the power source to J11 (GND1).
If the power source does not include a current meter, connect a
current meter in series with the input source voltage. Connect the
positive lead (+) of the power source to the ammeter positive (+)
connection, the negative lead (−) of the power source to J11
(GND1) on the evaluation board, and the negative lead (−) of
the ammeter to J1 (VIN_1) on the board. Be aware that the current
meters add resistance to the input source and this voltage reduces
with high output currents.
Output Load
Connect an electronic load or resistor to set the load current. If
the load includes an ammeter, or if the current is not measured,
connect the load directly to the evaluation board, with the positive
(+) load connected to one of the channels. For example, connect
Buck 1, J5 (VOUT1) and the negative (−) load connection to J8
(PGND).
If an ammeter is used, connect it in series with the load. Connect
the positive (+) ammeter terminal to the evaluation board for
Buck 1, J5 (VOUT1), the negative (−) ammeter terminal to the
positive (+) load terminal, and the negative (−) load terminal to the
evaluation board J9 (PGND).
Input and Output Voltmeters
Measure the input and output voltages with voltmeters. Make
sure that the voltmeters are connected to the appropriate
evaluation board terminals and not directly to the load or
power source.
If the voltmeters are not connected directly to the evaluation
board, the measured voltages will be incorrect due to the
voltage drop across the leads and/or connections between the
evaluation board, the power source, and/or the load.
Connect the input voltage measuring voltmeter positive termi-
nal (+) to the evaluation board J1 (VIN_1), and the negative (−)
terminal to the evaluation board J11 (GND1).
Connect the output voltage measuring voltmeter positive (+)
terminal to the evaluation board J5 (VOUT1) for measuring the
output voltage of Buck 1 and the negative (−) terminal to the
evaluation board J8 (PGND).
Turning On the Evaluation Board
When the power source and load are connected to the
ADP5032 evaluation board, the board can be powered for
operation. Perform the following steps:
1. Ensure that the power source voltage is greater than 4.2 V
and less than 5.5 V.
2. Ensure that the desired channel is enabled and monitor the
output voltage.
If the load is not already enabled, enable the load; check that it is
drawing the proper current, and that the output voltage maintains
voltage regulation.
MEASURING EVALUATION BOARD PERFORMANCE
Measuring Output Voltage Ripple on the Buck Regulator
To observe the output voltage ripple of Buck 1, place an oscillo-
scope probe across the output capacitor (COUT_1) with the probe
ground lead at the negative (−) capacitor terminal and the probe tip
at the positive (+) capacitor terminal. Set the oscilloscope to ac,
20 mV/division, and 2 μs/division time base.
Measuring the Switching Waveform
To observe the switching waveform with an oscilloscope, place
the oscilloscope probe tip at the end of the inductor with the
probe ground at GND. Set the oscilloscope to dc, 2 V/division,
and 2 μs/division time base.
Measuring Load Regulation
Test the load regulation by increasing the load at the output
and looking at the change in output voltage. To minimize
voltage drop, use short low resistance wires, especially for loads
approaching maximum current.

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3.295
3.300
3.305
3.310
3.315
3.320
3.325
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
V
OUT
(V)
I
OUT
(A)
V
IN
=5V
V
OUT
=3.3V
09137-002
Figure 2. Buck Load Regulation
Measuring Line Regulation
Vary the input voltage and examine the change in the output
voltage.
1.790
1.795
1.800
1.805
1.810
4.5 4.7 4.9 5.1 5.3 5.5
V
OUT
(V)
V
IN
(V)
V
IN
=5V
V
OUT
=1.8V
LOAD = 500mA
09137-003
Figure 3. Buck Efficiency
Measuring Efficiency
Measure the efficiency, η, by comparing the input power with
the output power.
ININ
OUTOUT
IV
IV
η×
×
=
Measure the input and output voltages as close as possible to the
input and output capacitors to reduce the effect of IR drops.
0
10
20
30
40
50
60
70
80
90
100
1 10 100 1000
EFFICIENCY (%)
IOUT (mA)
PSM
PWM VIN =5V
VOUT =3.3V
09137-004
Figure 4. Buck Efficiency
Measuring Inductor Current
Measure the inductor current by removing one end of the
inductor from its pad and connecting a current loop in series.
A current probe can be connected onto this wire.
Line Regulation of LDOs
For line regulation measurements, the regulator’s output is
monitored while its input is varied. For good line regulation,
the output must change as little as possible with varying input
levels. To ensure that the device is not in dropout mode during
this measurement, VIN must be varied between VOUT nominal
+ 0.5 V (or 2.3 V, whichever is greater) and VIN maximum. For
example, a fixed 2.8 V output needs VIN to be varied between
3.3 V and 5.5 V. This measurement can be repeated under
different load conditions. Figure 6 shows the typical line
regulation performance of the LDO with fixed 2.8 V output.
2.780
2.785
2.790
2.795
2.800
2.805
3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
V
IN
(V)
V
OUT
(V)
I
OUT
= 150mA
I
OUT
= 100mA
I
OUT
= 10mA
I
OUT
=1mA
I
OUT
= 100µA
09137-005
Figure 5. LDO Line Regulation

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Load Regulation of LDO Dropout Voltage of LDO
For load regulation measurements, the regulator output is
monitored while the load is varied. For good load regulation,
the output must change as little as possible with varying loads.
The input voltage must be held constant during this measure-
ment. The load current can be varied from 0 mA to 150 mA.
Figure 6 shows the typical load regulation performance of the
LDO with fixed 2.8 V output for an input voltage of 3.3 V.
Dropout voltage is defined as the input-to-output voltage
differential when the input voltage is set to the nominal output
voltage. This applies only for output voltages above 2.3 V.
Dropout voltage increases with larger loads. For more accurate
measurements, a second voltmeter can be used to monitor the
input voltage across the input capacitor. The input supply
voltage may need to be adjusted to account for IR drops,
especially if large load currents are used.
2.790
2.792
2.794
2.796
2.798
2.800
2.802
2.804
2.806
2.808
2.810
0 0.02 0.04 0.06 0.08 0.10 0.12 0.14
I
OUT
(A)
V
OUT
(V)
09137-006
Ground Current Consumption of LDO
Ground current measurements can determine how much
current the internal circuits of the regulator consume while the
circuits perform the regulation function. To be efficient, the
regulator needs to consume as little current as possible.
Typically, the regulator uses the maximum current when
supplying its largest load level (150 mA). When the device is
disabled, the ground current drops to less than 1 mA.
Figure 6. LDO Load Regulation

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MEASURING OUTPUT VOLTAGE
Figure 7 shows how the evaluation board can be connected to a
voltage source and a voltmeter for basic output voltage accuracy
measurements. A resistor can be used as the load for the
regulator. Ensure that the resistor has a power rating adequate
to handle the power expected to be dissipated across it. An
electronic load can also be used as an alternative. Ensure that
the voltage source can supply enough current for the expected
load levels.
09137-007
VOLTAGE SOURCE
+–
VOLTMETER
+–
1 99711
Figure 7. Output Voltage Measurement

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MEASURING GROUND CURRENT
Figure 8 shows the evaluation board connected to a voltage
source and an ammeter for ground current measurements. A
resistor can be used as the load for the regulator. Ensure that the
resistor has a power rating that is adequate to handle the power
expected to be dissipated across it. An electronic load can be used
as an alternative. Ensure that the voltage source used can supply
enough current for the expected load levels.
09137-008
VOLTAGE SOURCE
+–
VOLTMETER
+–
0 00112
Figure 8. Ground Current Measurement

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EVALUATION BOARD SCHEMATICS AND ARTWORK
09137-009
BUCK1
BUCK2
LDO1
LDO2
SW1
SW2
VOUT1
VOUT2
VOUT1
VOUT2
PGND1
PGND2
VOUT3
VOUT4
L1
CBMF1606
L2
CBMF1606
VIN1 D2
C2
D1
D3
C3
D4
A1
A4
VIN2
VIN3
VIN4
AGND
MODE
LEDI
LEDO
ADP5032
U1
C1
C4
A2
A3
B1
B2
B3
B4
JP11
VOUT1
JP12
VOUT2
JP13
VIN
12
12
12
D4
INDICATOR LED
C6
4.7µF
CD402STD
C7
1µF
CD402STD
C5
4.7µF
CD402STD
J2
VIN_1
VIN_2
VIN1
VIN2
VIN4
VIN3
J1
J8 PGND
J6 VOUT2
J9 PGND
J7 VOUT3
J10 PGND
VOUT1
J5
C4
1µF
CD402STD
J11
GND1
J12
GND2
3
JP3
MODE
2
1
3
2
1
3
JP4
LEDIN
2
1
3
2
1
COUT_1
10µF
CD603STD
COUT_2
10µF
CD603STD
COUT_3
1µF
CD402STD
J14 VOUT4
J13 PGND
COUT_4
1µF
CD402STD
Figure 9. Evaluation Board Schematic of ADP5032
0
9137-010
Figure 10. Top Layer, Recommended Layout

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09137-011
Figure 11. Second Layer, Recommended Layout
09137-012
Figure 12. Third Layer, Recommended Layout

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09137-013
Figure 13. Bottom Layer, Recommended Layout

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ORDERING INFORMATION
BILL OF MATERIALS
Table 1.
Qty. Reference Designator Description Manufacturer Part Number
1 U1 ADP5032 micro PMU—4 regulators Analog Devices ADP5032
2 C5, C6 Capacitor, MLCC, 4.7 μF, 6.3V, 0402, X5R Panasonic—ECG ECJ-0EB0J475M
4 C7, C4, COUT_3 ,COUT_4 Capacitor, MLCC, 1.0 μF, 6.3V, 0402, X5R Taiyo Yuden LMK105BJ105MV-F
2 COUT_2, COUT_1 Capacitor, MLCC, 10.0 μF, 6.3V, 0603, X5R Taiyo Yuden JMK107BJ106MA-T
2 L1, L2 Inductor, 1.0 μH, 0.29 A, 90 mΩ Taiyo Yuden CBMF1608T1R0M

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NOTES
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD.Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITEDTO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG09137-0-7/10(0)